Yes, broccoli can make urine smell for some people. This harmless, temporary effect is caused by sulfur compounds released during digestion.
You’ve probably heard the old saying that asparagus makes your urine smell funny. Broccoli — that green vegetable often celebrated as a superfood — can do the same thing. It catches many people off guard because broccoli doesn’t have a strong aroma on its own. Yet after eating a serving of steamed or roasted broccoli, some people notice a distinct, sulfur-like odor the next time they use the bathroom.
So yes, broccoli can make urine smell. The effect is short-lived and generally harmless, tied to sulfur-containing compounds that form during digestion. This article walks through why it happens, who notices it, and how to tell the difference between a dietary quirk and something that may need medical attention. It’s one of those normal bodily responses that doesn’t mean anything is wrong.
What Causes the Smell After Eating Broccoli?
Broccoli belongs to the cruciferous vegetable family, which includes cabbage, Brussels sprouts, and kale. These vegetables are rich in sulfur-containing compounds called glucosinolates. When your body digests broccoli, it breaks these compounds down into smaller molecules, including volatile sulfur gases.
Some digestive processes may produce methyl mercaptan, a sulfur-containing gas that can give urine a foul odor. As these gases are absorbed into your bloodstream and filtered by your kidneys, they end up in urine, producing that noticeable smell. The effect is similar to what happens with asparagus, though the chemical paths differ slightly.
Your body is simply excreting the sulfur waste from digestion. Drinking plenty of water can dilute the odor, making it less noticeable. It’s a harmless process that runs its course within hours.
Why Not Everyone Notices the Same Odor
You might wonder why some people complain about broccoli’s after-effects while others don’t notice a thing. A couple of factors come into play, from genetics to what else you ate that day.
- Genetics and sensitivity: Just like with asparagus, your ability to smell sulfur compounds in urine may be genetic. Some people carry a gene that makes them more sensitive to these odors, while others can’t detect them at all.
- Your personal digestive chemistry: The amount of sulfur compounds your body produces depends partly on your gut microbiome. Different people break down broccoli at slightly different rates, which can affect the intensity and presence of odor.
- How much broccoli you ate: A small side of broccoli may not cause noticeable odor, while a large serving — or eating it multiple days in a row — could make the sulfur concentration high enough to smell.
- Your hydration level: When you’re well-hydrated, urine is dilute and odors are less pronounced. Concentrated urine from dehydration can make any existing odor much stronger.
- What else you ate: Combining broccoli with other sulfur-rich foods like garlic, onions, or eggs may intensify the smell, making it more likely you’ll notice it.
In short, whether or not broccoli makes your urine smell depends on a mix of genetics, diet, and hydration. If you don’t smell anything, it doesn’t mean your digestion is abnormal — you might just not be sensitive to it.
The Difference Between Harmless Odor and Concerning Symptoms
Most of the time, smelly urine after broccoli is nothing to worry about. Per the harmless urine odor after broccoli guide from Northwell Health, this is a normal digestive byproduct. If the only change is the smell — with no pain, burning, or urgency — you can chalk it up to your meal.
However, urine odor can sometimes signal a health issue. A sulfur-like smell paired with a frequent urge to urinate, pelvic pressure, or fever may indicate a urinary tract infection (UTI). Medical News Today notes that a UTI can cause urine to smell like sulfur, along with other symptoms.
Other conditions like diabetes (sweet or fruity smell) or liver problems can also alter urine odor. But in the absence of other symptoms, the occasional odor after a plate of broccoli is simply a sign that your body is processing what you ate.
| Odor Characteristic | Dietary Cause (Broccoli, etc.) | Possible Medical Concern |
|---|---|---|
| Sulfur or “rotten egg” smell | After cruciferous veggies, garlic, or onions | UTI, liver issues (rare) |
| Sweet or fruity smell | Not typical from diet | Uncontrolled diabetes (ketones) |
| Strong ammonia smell | Dehydration plus any food | UTI or kidney problems |
| Fishy smell | Certain foods like fish or some supplements | Bacterial vaginosis (women), certain infections |
| Musty or mousy smell | Not common | Phenylketonuria (PKU) — rare genetic condition |
If you’re ever unsure about a change in urine odor, it’s fine to check with a healthcare provider. For most people, the smell that appears after a broccoli-rich meal is just a reminder that digestion is at work. Noticing a strong smell after eating broccoli is common, and it typically resolves within a few hours to a day.
How Long Does Broccoli Urine Smell Last?
If you’ve noticed the odor, you’re probably wondering how long it sticks around. The timeline is pretty short, but a few factors can extend it.
- About a few hours to one day. In most cases, the smell clears within 24 hours — the time it takes for your body to fully digest and excrete the sulfur compounds. Once the broccoli is out of your system, the odor goes with it.
- Larger servings may prolong the effect. A big bowl of broccoli contains more sulfur compounds, meaning more volatile gases are produced and their elimination takes a bit longer. The smell might last up to a day and a half.
- Hydration speeds things up. Drinking extra water can dilute your urine and flush the sulfur byproducts more quickly, reducing both the intensity and duration of the odor.
- If you eat broccoli multiple days in a row, the smell may persist. The effect can be cumulative — each day’s digestion adds another dose of sulfur gases, so the odor may not fully disappear until you take a break from cruciferous veggies.
Bottom line: broccoli urine smell is short-lived. If the odor lasts longer than two days without you having eaten any more cruciferous foods, or if other symptoms develop, it’s reasonable to check in with a doctor.
Other Common Causes of Sulfur-Smelling Urine
If broccoli isn’t the culprit, several other factors can create a similar sulfur-like odor in urine. Dehydration is one of the most common — concentrated urine naturally smells stronger, and any sulfur compounds become more noticeable.
Certain medications and supplements can also cause a sulfur smell. Healthline’s article on medications causing sulfur smell notes that vitamin B supplements and sulfa drugs can be responsible for this side effect.
Other dietary sources beyond broccoli include asparagus (classically), onions, garlic, cabbage, curry, cumin, and red meat. Coffee can also leave a distinct scent. If the odor appears after eating any of these foods and resolves on its own, it’s likely harmless.
| Cause | Typical Odor | Notes |
|---|---|---|
| Asparagus | Sulfur-like, “cabbage” smell | Genetics determine if you can smell it; harmless |
| Dehydration | Strong ammonia or sulfur | Odor disappears once hydrated |
| Vitamin B supplements | Sharp, sulfur-like | Common side effect; harmless but noticeable |
The Bottom Line
Yes, broccoli can make your urine smell. This temporary, harmless effect is caused by sulfur compounds released during digestion. The odor typically lasts less than a day and is nothing to worry about on its own. Staying hydrated and aware of what you’re eating can help you distinguish dietary quirks from potential medical issues.
If you notice a persistent sulfur-smelling urine that lasts beyond a day or comes with pain, burning, or fever, consider checking with your primary care doctor or a urologist. They can run a simple urine test to rule out a UTI or other causes and help you pinpoint what’s affecting your body.
References & Sources
- Northwell Health. “Urine Unusual Smell” Foul-smelling urine on its own, especially after eating foods like broccoli, is generally not a cause for concern and is considered a harmless side effect of digestion.
- Healthline. “Urine Smells Like Sulfur” Medications such as vitamin B supplements and sulfa drugs can also cause urine to smell like sulfur, similar to the effect of certain foods.